Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1986 Mercury Lynx Base, MTXIIFACTORY OEM SERVICE PROCEDURE
Code/Test Menu (KOER)
KEY ON/ENGINE RUNNING (KOER) SELF-TEST MENU
| Code No. | Go To Test No. (Step No.) | ||
|---|---|---|---|
| 12 | Z (1) | ||
| 13 (1) | Z (3) | ||
| 17 (1.9L EFI Only) | Z (11) | ||
| 21 | G (1) | ||
| 22 | H (1) | ||
| 23 | J (1) | ||
| 24 | D (1) | ||
| 25 (2.3L EFI Turbo Only) | I (1) | ||
| 26 | K (1) | ||
| 34 | W (1) | ||
| 41 | Q (11) | ||
| 42 | Q (8) | ||
| 73 | J (10) | ||
| 76 | K (1O) | ||
| 77 | KK (1) | ||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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